c 2b 2b set add element

1// set::insert (C++98)
2#include <iostream>
3#include <set>
4
5int main ()
6{
7  std::set<int> myset;
8  std::set<int>::iterator it;
9  std::pair<std::set<int>::iterator,bool> ret;
10
11  // set some initial values:
12  for (int i=1; i<=5; ++i) myset.insert(i*10);    // set: 10 20 30 40 50
13
14  ret = myset.insert(20);               // no new element inserted
15
16  if (ret.second==false) it=ret.first;  // "it" now points to element 20
17
18  myset.insert (it,25);                 // max efficiency inserting
19  myset.insert (it,24);                 // max efficiency inserting
20  myset.insert (it,26);                 // no max efficiency inserting
21
22  int myints[]= {5,10,15};              // 10 already in set, not inserted
23  myset.insert (myints,myints+3);
24
25  std::cout << "myset contains:";
26  for (it=myset.begin(); it!=myset.end(); ++it)
27    std::cout << ' ' << *it;
28  std::cout << '\n';
29
30  return 0;
31}